The western boundary of WRIA 13 incorporates only the eastern shore of Eld Inlet and its drainages. The western shore of Eld Inlet is part of WRIA 14. The inlet itself has about 30 miles of total shoreline with its widest section stretching 7,000 feet between Frye Cove on the west and Countryside Beach on the east. Cooper Point peninsula is the eastern boundary of the watershed; it extends 7.5 miles into the southernmost reaches of Puget Sound. The highest point on the peninsula is 243 feet just west of The Evergreen State College. The northern end of the peninsula is generally less than a mile across, while its southern end widens to over four miles. The land rises steeply from Puget Sound, with banks often reaching a height of 100 feet within 500 feet of the beach. The steep slopes are indented in many places by draws, ravines and gullies holding small seasonal stream courses. The one exception to this topography is the estuarine area at the southwest corner of the peninsula where the land adjacent to Mud Bay is very low and flat, rising
only a few feet above high tide level.

The entire Eld Inlet watershed encompasses approximately 23,220 acres. The primary streams in the watershed are McLane Creek, it's tributaries, and Green Cove Creek. The McLane Creek drainage system incorporates a total of 7,360 acres. It begins in the Black Hills and flows northward, forming Delphi Valley and terminating at the estuary of Mud Bay. The Delphi Valley and surrounding Black Hills exhibit a wide variety of topographies. The highest point is 807 feet in the Black Hills north of Black Lake, while the lowest is Mud Bay at sea level. Cedar Flats and Swift Creeks are the major tributaries of McLane Creek that originate in the Black Hills, while
Perkins Creek enters McLane from the Cooper Point peninsula side. Green Cove Creek originates at Grass Lake on the Cooper Point peninsula and runs 3.6 miles north along the eastern boundary of the watershed emptying into Green Cove midway up the peninsula.

As of 1988, the population within the watershed was 6,728 with 2,629 dwelling units. By the year 2010 the population and dwelling units are expected to increase to 12,073 and 4,932 respectively. While houses are generally spread out over the 23,220 acres of the watershed, housing at a density of 1 unit/acre or more can be found all along the saltwater shoreline of Eld Inlet (Eld Inlet
Watershed Management Committee 1989).

Description from the Salmon Habitat Limiting Factors Final Report Water Resource Inventory Area 13. For more information including salmonid stock status see the previously stated document or the Salmon Habitat Protection and Restoration Plan for Water Resource Inventory Area 13, Deschutes.